液体特性的光谱液滴分析技术研究

The liquid signature analysis technology can acquire the tested liquid's fingerprint by monitoring the drop formation process under a certain measuring condition. It has been proved that the fingerprint is unique and related to the liquid's characteristics. Now the liquid signature analysis methods focus on the research on the physical properties of the liquid to be measured. In this project one method based on spectral liquid signature analysis tenique is proposed to research the property of liquid, the liquid signature analysis and miniature spectral analysis methods are combined to construct portable, on-line analysis method to obtain liquid's information. The miniature spectrometer has the advantages of small volume, fast detection and low cost, but for each miniature spectrometer, it is difficult to do component analysis for unknown liquid for its narrow spectral range. This project compromises miniature spectrometer and liquid signature analysis technology, and can keep the two analysis methods' respective advantages, and can complement each other, and the liquid's optical, electrical signal can be acquired and analyzed synchronously.With the spectral luqid signature analysis method the physical and chemical properties can be obtained at the same time to constructe the liquid's integrated fingerprint. And the precise identification of liquid and liquid composition quantitative analysis can be realized with the fingerprint. This project will provide theoretical and technical foundation for design of the real-time, on-line liquid detection, monitoring instruments, and can provide a new multifunctional detection method for environmental protection, water resources monitoring and other related liquid detection fields.

液滴分析技术通过监测液滴的生成过程，得到被测液体的液滴指纹图。该图与被测液体的特性相关，具有唯一性。目前的液滴分析方法着重研究被测液体的物理特性。本项目提出基于光谱液滴分析技术研究液体综合特性的方法，结合液滴分析技术和小型光谱分析方法，构建便携、适于在线分析的液体分析手段，获取液体信息。小型光谱仪体积小、探测速度快、成本低，但对于每台小型光谱仪，只能在较窄的光谱范围内工作，单靠小型光谱仪对未知液体进行成分分析较困难。本项目融合小型光谱仪与液滴分析技术,保持两种分析手段各自的优点，并互为补充，对液体的光学、电学等信号进行同步采集和分析，同时获取液体的物理、化学特性信息，构建液体综合指纹图，以精确定性识别液体并对液体成分进行定量分析。将为实时在线液体检测、监控仪器的设计提供理论和技术基础，并将为环境保护、水资源监测等涉及液体检测的领域，提供一种新的多功能检测方法。

光谱液滴分析系统通过融合光谱分析技术和液滴分析技术，将光纤、电容液滴分析方法与小型光谱仪结合起来，既可以得到样品液滴在不同时刻的轮廓与电学、光学信息的关系，也可以同时得到该液体在设定波段的光谱信息，经过数据融合可得到由液体物理、化学及力学等特性综合确定的三维液滴指纹图。本项目通过技术融合，搭建了一体化的测量仪器。在光谱测量中引入了流动比色装置，解决了对不同液体进行光谱测量时的条件一致性问题。运用光谱液滴分析系统，实现了对液体光谱信号和光纤、电容信号的同步采集，并通过数据融合，得到被测液体的三维液滴指纹图，为精确识别液体提供了重要依据。同时，运用CCD摄像机实时记录液滴的生长过程，并进行液滴图像分析，实现了液滴轮廓特征参数的提取和分析。利用光谱液滴分析系统，对不同液体进行了实验分析，根据实验中得到的液体特征数据，建立液体样品特征数据库，实现对数据查询对照和对数据库中数据的管理操作，从而可对液体进行定性鉴别。同时，结合化学计量学方法，实现了光谱数据预处理以及建模测算的定量分析模型的建立，从而可以对液体组分进行定量分析。通过对多组分液体的建模实验，验证了方法的可行性。